Display Device and Electronic Device

1. A display device comprising: a receiving circuit comprising an operational amplifier; and a display portion, wherein the display portion is configured to display an image at a frame frequency of less than or equal to 1 Hz in a still image display period, and wherein the receiving circuit is configured to stop supply of a bias current to the operational amplifier in the still image display period.

2. The display device according to claim 1 , further comprising a driver circuit, wherein the driver circuit is electrically connected to the display portion.

3. The display device according to claim 2 , wherein the driver circuit is configured to stop operation in the still image display period.

4. The display device according to claim 2 , wherein the display device is configured to stop supply of a clock signal to the driver circuit in the still image display period.

5. The display device according to claim 1 , wherein the display portion comprises a transistor and a display element.

6. The display device according to claim 5 , wherein the transistor comprises an oxide semiconductor.

7. The display device according to claim 1 , wherein the frame frequency is less than or equal to 0.2 Hz.

8. An electronic device comprising: the display device according to claim 1 ; and at least one of a touch sensor, an operation switch, a microphone, and a speaker.

9. A display device comprising: a first circuit comprising an operational amplifier; and a display portion, wherein the display portion is configured to display a still image in a first period, and display a moving image in a second period, wherein the display portion is configured to display an image at a frame frequency of less than or equal to 1 Hz in the first period, and wherein the first circuit is configured to stop supply of a bias current to the operational amplifier in the first period.

10. The display device according to claim 9 , wherein the first period and the second period are configured to be switched by a control signal.

11. The display device according to claim 9 , wherein the display portion comprises a transistor and a display element.

12. The display device according to claim 11 , wherein the transistor comprises an oxide semiconductor.

13. The display device according to claim 9 , wherein the frame frequency is less than or equal to 0.2 Hz.

14. An electronic device comprising: the display device according to claim 9 ; and at least one of a touch sensor, an operation switch, a microphone, and a speaker.